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<head>
    <meta charset="UTF-8">
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    <meta name="viewport" content="width=device-width,initial-scale=1.0">
    <title>Document</title>
    
</head>
<body>
    <div id="app"></div>
</body>
    <script src="https://unpkg.com/vue@next"></script>
<script>
    const {onBeforeMount,onMounted,onBeforeUpdate,onUpdated,onBeforeUnmount, onUnmounted} = Vue;
    const count = ref(0);
    onBeforeMount(() => {
        console.log('-------onBeforeMount-----------')
    })
    onMounted(() => {
        console.log('-------onMounted-----------')
    })
    onBeforeUpdate(() => {
        console.log('-------onBeforeUpdate-----------')
    })
    onUpdated(() => {
        console.log('-------onUpdated-----------')
    })
    onBeforeUnmount(() => {
        console.log('-------onBeforeUnmount-----------')
    })
    onUnmounted(() => {
        console.log('-------onUnmounted-----------')
    })
    return { count }
       
           const vm = app.mount("#app");
    </script>
</html>